Home / 366.21-505.31-218.79

Finding the Fourth Proportional to 366.21, 505.31 and 218.79

Calculator

Solution

The fourth proportional to 366.21, 505.31 and 218.79 is: 301.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    366.21 : 505.31 = 218.79 : x
  2. Step 2: Convert to fraction form
    366.21/505.31 = 218.79/x
  3. Step 3: Cross multiply
    366.21x = 505.31 × 218.79
  4. Step 4: Simplify right side
    366.21x = 110,555.68
  5. Step 5: Solve for x
    x = 110,555.68/366.21
  6. Step 6: Final answer
    x = 301.89

Related Problems

Find fourth proportional to 183.11, 252.65 and 109.40
Half scale
Find fourth proportional to 732.42, 1,010.61 and 437.58
Double scale
Find fourth proportional to 367.21, 506.68 and 219.79
Similar ratio
Find fourth proportional to 549.32, 757.96 and 328.19
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.